An Investigation of Velocity-Dependent Friction in Wheel-Rail Rolling Contact

摘要

Friction between sliding surfaces decreases as the velocity of sliding increases ('friction'). This paper investigates the velocity-dependent friction relationships in non-Hertzian models of wheel-rail rolling contact. The effect of falling friction on tangential stress distribution and slip is examined. In otherwise steady rolling with constant creep, falling friction introduces a stick-slip oscillation to the trailing edge of the contact. This oscillation is increasingly unstable with increasing creep. The stick-slip behaviour at the trailing edge leads to sudden changes in the tangential stress distribution in the stick zone, including intermittent slip at the leading edge of the contact.